samsung galaxy j1 sd card for default

Solution
Since I believe that tablet comes with Android "KitKat", it would not be able to do what you are wanting to do. However, if you can somehow upgrade the device to "Marshmallow" you 'may' be able to get it to work. I say 'may' work as manufacturers sometimes limit the ability to change the card to "Internal" storage no matter the Android version you are running.


How to turn external SD card into internal storage on "Marshmallow".

NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).

1. Go to device “Settings”, then select “Storage”.
2. Select your "SD Card", then...
Since I believe that tablet comes with Android "KitKat", it would not be able to do what you are wanting to do. However, if you can somehow upgrade the device to "Marshmallow" you 'may' be able to get it to work. I say 'may' work as manufacturers sometimes limit the ability to change the card to "Internal" storage no matter the Android version you are running.


How to turn external SD card into internal storage on "Marshmallow".

NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).

1. Go to device “Settings”, then select “Storage”.
2. Select your "SD Card", then tap the “three-dot menu“ (top-right), now select “Settings” from in there.
3. Now select “Format as internal”, and then “Erase & Format”.
4. Your SD Card will now be formatted as internal storage.
5. Reboot your tablet.

NOTE: If you don't reboot the tablet, many things may not work correctly, so make sure you do.

 
Solution